core: split Context into a separate grpc-context artifact.
The Context API is not particularly gRPC-specific, and will be used by
Census as its context propagation mechanism.
Removed all dependencies to make it easy for other libraries to depend
on.
diff --git a/core/build.gradle b/core/build.gradle
index b03e06c..6d6147c 100644
--- a/core/build.gradle
+++ b/core/build.gradle
@@ -7,7 +7,8 @@
dependencies {
compile libraries.guava,
libraries.errorprone,
- libraries.jsr305
+ libraries.jsr305,
+ project(':grpc-context')
testCompile project(':grpc-testing')
}